Plane-i ron-sharpening apparatus



G ABRANSGROVB. PLANE IRON SHARPBNING APPARATUS.

Patented May 5, 1891*.

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(No Model.)

UNITE *STATES CHARLES BRANSGROVE, OF LULU, MICHIGAN.

PLAN E-IRON-SHARPENING APPARATUS.

SPECIFICATION forming part of Letters .Patent No. 451,801, dated May 5, 1891.

Application filed December 18, 1890. Serial No. 375,133. (No model.)

To @ZZ whom it may concern,.-

Be it known that I, CHARLES BRANsGRovE', a citizen of the United States of America, residing at Lulu, in the county of Monroe and State of Michigan, have invented certain new andusefulImprovementsinPlane-Iron-Sharpening Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in machines for sharpening plane-irons.

The obj ect of the invention is to provide an apparatus by which two plane-irons can be sharpened at the same time; and it consists in the construction and combination of the parts, as will be hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure l is a perspective View of a plane-iron-sharpening machine constructed in accordance with my invention. Fig. 2 is a sectional view. Fig. 3 is a detail perspective view of the plane-holder.

A A refer to the side pieces of the main fram'e, which are braced by the transverse rods and shafts, as shown. To the inner side of each of the side pieces A is secured a track B, upony which the frame carrying the stone moves, said frame being provided with suitable anti-friction devices, as rollers. The

stone D is clamped in the frame C by means of the set-screw c, upward movement being prevented by transverse blocks cl d, said blocks being provided with openings or receptacles d', adapted to contain oil or Wat-er to be applied to the surface of the stone. The blocks d CZ are held down against the stone by set-screws Z9, which pass through threaded perforations in transverse bars attached to the side pieces A A. To one end of the frame C is connected a pitman c', operated from the Vcrank-shaft C said shaft carr in@ a 01earwheel which meshes with the main driving- Wheel, as shown. Upon this shaft to one side of the crank is secured a grinding or emery wheel C2, which is used for finishing off or grinding the ends of the plane-irons.

Both ends of the main frame are constructed substantially alike, and are adapted to receive means for holding the plane-iron so that it can be adjusted in proper relation to the sharpening-stone, as well as turned so that the edges being ground can be'readily examined, andL for this purpose the side pieces of the frame are provided with slots or Ways E E, openings ff, and open-ended slots having ratchet-teeth F.

G refers to the plane-holder, which is provided With trunnions g g, adjacent to which are arches carrying a cross-bar g', through which passes a set-screw having a bearinghead h. The trunnions enter sliding blocks e in the side pieces, above and beneath which are located spiral springs, and the tension of said springs upon the movable blocks e can be adj usted by the set-screws E', Which serve to give a :normal downward pressure upon the frame carrying the plane-iron. From the rear side of the plate G projects a flat plate H, through which passes a set-screw H', said setscreW also engaging with a lever I, one end of which is adapted to be passed into one of the slots f, while the other end engages one of the ratchet-teeth F, and by properly setting the screw I-I the angle of the plane-iron can be varied. Vhen it is desired to inspect the edge of the plane-iron, it can be done by simply releasing the lever I, which will permit the parts to be tilted, as shown in dotted lines, Fig. 2.

In operation, when it is desired to sharpen plane-irons the levers I are released, the planeironssecured upon the plate Gr by the setscrew, after which the frame is rocked to bring the plane-iron in contact with the stone and the lever I turned to lock the parts, and the proper angle is given by turning the thumb-screw H or placing the lever in one or the other of the slots f. Now by turning the main driving-wheel the stone will be reciprocated, and the plane-irons Will be held thereon by springpressure, which can be regulated by the set-screwsE. After the plane-irons have been sharpened the corners can be finished by holding the same upon the rotary grindingstone.

I-Iaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-' IOO 1. The combination, in a plane-sharpening machine, of a frame or support carrying a sharpening-stone and provided with means for reeiprocatingthe sam e, and vertical side pieces carrying two adjustable plane-iron holders, substantially as shown, and for the purpose set forth.

2. In combination with a frame havingside pieces A A, adjustable bearing-blocks e, clampplates G, pivotally attached to said bearingblocks, a flat plate I-I, having a set-screw, and locking-lever I, substantially as set forth.

3. In combination with the side pieces A A, oppositely-inclined Ways E E, provided with movable bearing-blocks e, and a holder G, pivotally attached to said bearing-blocks and provided With means for holding the same at a 

